If you are a couple, one person would be assigned to office responsibilities including the KOA reservation and registration system as well as checking in/out guests, selling store products, keeping the office, game room, playground and surrounding outside areas clean. The second person would pump propane, escort guest to sites, assist guests as needed with hooking up their RVs, campground cleanup, assist guest with minor electric, water and cable TV questions and other duties as needed.
A single person primarily would have the office responsibilities underlined above but would also have to know how to pump propane, escort guests to their sites, do general campground cleanup (picking up sites and clean firepits and grills) and other duties as needed.